package com.tools.plugin.utils;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 反射工具类. 提供调用getter/setter方法, 访问私有变量, 调用私有方法, 获取泛型类型Class, 被AOP过的真实类等工具函数.
 */
public class Reflections {
    private static final String SETTER_PREFIX = "set";
    private static final String GETTER_PREFIX = "get";
    private static final String CGLIB_CLASS_SEPARATOR = "$$";
    private static Logger logger = LoggerFactory.getLogger(Reflections.class);

    /**
     * 调用Getter方法.
     */
    public static Object invokeGetter(Object obj, String propertyName) {
        String getterMethodName = GETTER_PREFIX + StringUtils.capitalize(propertyName);
        return invokeMethod(obj, getterMethodName, new Class[] {}, new Object[] {});
    }

    /**
     * 调用Setter方法, 仅匹配方法名。
     */
    public static void invokeSetter(Object obj, String propertyName, Object value) {
        String setterMethodName = SETTER_PREFIX + StringUtils.capitalize(propertyName);
        invokeMethodByName(obj, setterMethodName, new Object[] {value});
    }

    /**
     * 直接读取对象属性值, 无视private/protected修饰符, 不经过getter函数.
     */
    public static Object getFieldValue(final Object obj, final String fieldName) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName
                                               + "] on target [" + obj + "]");
        }
        Object result = null;
        try {
            result = field.get(obj);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常{}", e.getMessage());
        }
        return result;
    }

    /**
     * 直接设置对象属性值, 无视private/protected修饰符, 不经过setter函数.
     */
    public static void setFieldValue(final Object obj, final String fieldName, final Object value) {
        Field field = getAccessibleField(obj, fieldName);

        if (field == null) {
            throw new IllegalArgumentException("Could not find field [" + fieldName
                                               + "] on target [" + obj + "]");
        }

        try {
            field.set(obj, value);
        } catch (IllegalAccessException e) {
            logger.error("不可能抛出的异常:{}", e.getMessage());
        }
    }

    /**
     * 直接调用对象方法, 无视private/protected修饰符. 用于一次性调用的情况，否则应使用getAccessibleMethod()函数获得Method后反复调用.
     * 同时匹配方法名+参数类型，
     */
    public static Object invokeMethod(final Object obj, final String methodName,
                                      final Class<?>[] parameterTypes, final Object[] args) {
        Method method = getAccessibleMethod(obj, methodName, parameterTypes);
        if (method == null) {
            throw new IllegalArgumentException("Could not find method [" + methodName
                                               + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * 直接调用对象方法, 无视private/protected修饰符， 用于一次性调用的情况，否则应使用getAccessibleMethodByName()函数获得Method后反复调用.
     * 只匹配函数名，如果有多个同名函数调用第一个。
     */
    public static Object invokeMethodByName(final Object obj, final String methodName,
                                            final Object[] args) {
        Method method = getAccessibleMethodByName(obj, methodName);
        if (method == null) {
            throw new IllegalArgumentException("Could not find method [" + methodName
                                               + "] on target [" + obj + "]");
        }

        try {
            return method.invoke(obj, args);
        } catch (Exception e) {
            throw convertReflectionExceptionToUnchecked(e);
        }
    }

    /**
     * 循环向上转型, 获取对象的DeclaredField, 并强制设置为可访问. 如向上转型到Object仍无法找到, 返回null.
     */
    public static Field getAccessibleField(final Object obj, final String fieldName) {
        Validate.notNull(obj, "object can't be null");
        Validate.notBlank(fieldName, "fieldName can't be blank");
        for (Class<?> superClass = obj.getClass(); superClass != Object.class; superClass = superClass
            .getSuperclass()) {
            try {
                Field field = superClass.getDeclaredField(fieldName);
                makeAccessible(field);
                return field;
            } catch (NoSuchFieldException e) {// NOSONAR
                // Field不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问. 如向上转型到Object仍无法找到, 返回null. 匹配函数名+参数类型。 用于方法需要被多次调用的情况.
     * 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
     */
    public static Method getAccessibleMethod(final Object obj, final String methodName,
                                             final Class<?>... parameterTypes) {
        Validate.notNull(obj, "object can't be null");
        Validate.notBlank(methodName, "methodName can't be blank");

        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType
            .getSuperclass()) {
            try {
                Method method = searchType.getDeclaredMethod(methodName, parameterTypes);
                makeAccessible(method);
                return method;
            } catch (NoSuchMethodException e) {
                // Method不在当前类定义,继续向上转型
            }
        }
        return null;
    }

    /**
     * 循环向上转型, 获取对象的DeclaredMethod,并强制设置为可访问. 如向上转型到Object仍无法找到, 返回null. 只匹配函数名。 用于方法需要被多次调用的情况.
     * 先使用本函数先取得Method,然后调用Method.invoke(Object obj, Object... args)
     */
    public static Method getAccessibleMethodByName(final Object obj, final String methodName) {
        Validate.notNull(obj, "object can't be null");
        Validate.notBlank(methodName, "methodName can't be blank");

        for (Class<?> searchType = obj.getClass(); searchType != Object.class; searchType = searchType
            .getSuperclass()) {
            Method[] methods = searchType.getDeclaredMethods();
            for (Method method : methods) {
                if (method.getName().equals(methodName)) {
                    makeAccessible(method);
                    return method;
                }
            }
        }
        return null;
    }

    /**
     * 改变private/protected的方法为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
     */
    public static void makeAccessible(Method method) {
        if ( ( !Modifier.isPublic(method.getModifiers()) || !Modifier.isPublic(method
            .getDeclaringClass().getModifiers())) && !method.isAccessible()) {
            method.setAccessible(true);
        }
    }

    /**
     * 改变private/protected的成员变量为public，尽量不调用实际改动的语句，避免JDK的SecurityManager抱怨。
     */
    public static void makeAccessible(Field field) {
        if ( ( !Modifier.isPublic(field.getModifiers())
              || !Modifier.isPublic(field.getDeclaringClass().getModifiers()) || Modifier
            .isFinal(field.getModifiers())) && !field.isAccessible()) {
            field.setAccessible(true);
        }
    }

    /**
     * 通过反射, 获得Class定义中声明的泛型参数的类型, 注意泛型必须定义在父类处 如无法找到, 返回Object.class. eg. public UserDao extends
     * HibernateDao<User>
     * 
     * @param clazz The class to introspect
     * @return the first generic declaration, or Object.class if cannot be determined
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static <T> Class<T> getClassGenricType(final Class clazz) {
        return getClassGenricType(clazz, 0);
    }

    /**
     * 通过反射, 获得Class定义中声明的父类的泛型参数的类型. 如无法找到, 返回Object.class. 如public UserDao extends
     * HibernateDao<User,Long>
     * 
     * @param clazz clazz The class to introspect
     * @param index the Index of the generic ddeclaration,start from 0.
     * @return the index generic declaration, or Object.class if cannot be determined
     */
    @SuppressWarnings("rawtypes")
    public static Class getClassGenricType(final Class clazz, final int index) {

        Type genType = clazz.getGenericSuperclass();

        if ( ! (genType instanceof ParameterizedType)) {
            logger.warn(clazz.getSimpleName() + "'s superclass not ParameterizedType");
            return Object.class;
        }

        Type[] params = ((ParameterizedType)genType).getActualTypeArguments();

        if (index >= params.length || index < 0) {
            logger.warn("Index: " + index + ", Size of " + clazz.getSimpleName()
                        + "'s Parameterized Type: " + params.length);
            return Object.class;
        }
        if ( ! (params[index] instanceof Class)) {
            logger.warn(clazz.getSimpleName()
                        + " not set the actual class on superclass generic parameter");
            return Object.class;
        }

        return (Class)params[index];
    }

    @SuppressWarnings("rawtypes")
    public static Class<?> getUserClass(Object instance) {
        AssertUtil.notNull(instance, "Instance must not be null");
        Class clazz = instance.getClass();
        if (clazz != null && clazz.getName().contains(CGLIB_CLASS_SEPARATOR)) {
            Class<?> superClass = clazz.getSuperclass();
            if (superClass != null && !Object.class.equals(superClass)) {
                return superClass;
            }
        }
        return clazz;

    }

    /**
     * 将反射时的checked exception转换为unchecked exception.
     */
    public static RuntimeException convertReflectionExceptionToUnchecked(Exception e) {
        if (e instanceof IllegalAccessException || e instanceof IllegalArgumentException
            || e instanceof NoSuchMethodException) {
            return new IllegalArgumentException(e);
        } else if (e instanceof InvocationTargetException) {
            return new RuntimeException( ((InvocationTargetException)e).getTargetException());
        } else if (e instanceof RuntimeException) {
            return (RuntimeException)e;
        }
        return new RuntimeException("Unexpected Checked Exception.", e);
    }
    
    /**
     * 把javabean对象转换成map返回。
     * @return map对象
     */
    public static Map<Object,Object> convertBeanToMap(Object object){
    	Map<Object,Object> beanMap = new HashMap<Object,Object>();
    	try {
			BeanInfo beanInfo = Introspector.getBeanInfo(object.getClass());
			PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
			for(PropertyDescriptor property : propertyDescriptors){
			    String key = property.getName();
			    if (!key.equals("class")) {
			        Method getter = property.getReadMethod();
			        Object value = getter.invoke(object);
			        beanMap.put(key, value);
			    }
			}
		} catch (IllegalArgumentException e) {
			logger.error("Reflections class(convertBeanToMap method)javabean转换Map时发生异常："+e);
			throw new RuntimeException("Reflections class(convertBeanToMap method)javabean转换Map时发生异常：", e);
		} catch (IntrospectionException e) {
			logger.error("Reflections class(convertBeanToMap method)javabean转换Map时发生异常："+e);
			throw new RuntimeException("Reflections class(convertBeanToMap method)javabean转换Map时发生异常：", e);
		} catch (IllegalAccessException e) {
			logger.error("Reflections class(convertBeanToMap method)javabean转换Map时发生异常："+e);
			throw new RuntimeException("Reflections class(convertBeanToMap method)javabean转换Map时发生异常：", e);
		} catch (InvocationTargetException e) {
			logger.error("Reflections class(convertBeanToMap method)javabean转换Map时发生异常："+e);
			throw new RuntimeException("Reflections class(convertBeanToMap method)javabean转换Map时发生异常：", e);
		}
        return beanMap;
    }
}
